International organizations are important actors in the fight against global challenges such as climate change, poverty, and civil wars. To deliver on their promises, they need efficient, effective international public administrations (IPAs) with highly qualified and committed staff. However, public management research has not identified the antecedents of organizational commitment in IPAs. Drawing from traditional public management literature, this study examines how public service motivation

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... PSM) and person-organization fit (PO fit) influence organizational commitment in IPAs. Findings from a survey of 101 employees of a European IPA show that both PSM and PO fit have a positive effect on organizational commitment, but contrary to established results in public management research, PO fit does not act as a mediator in the relationship between PSM and commitment.